Which of the following techniques is the BEST way to determine project objectives ？

检验项目工作是否完成，需要使用：()

项目经理有责任了解要发送哪类信息因为他的（）可避免沟通障碍（）

A client has asked you to add scope of work to the project is under budget and a little ahead of schedule. What should you do ？

赶工一个任务时，你应该关注：（）